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Add origin adjustment for hitobject lifetime 

Visual inspection of taiko gameplay has shown that hitobjects appeared
on screen only when the origin of the hitobject came into the bounds
of the screen, instead of appearing when any visible part of the
hitobject came into the screen bounds.

This behaviour was due to lifetime calculation being based on the origin
of the hitobject and not taking into account the actual object
dimensions. Adjust the lifetime start of the hitobject by subtracting
the time needed to show the part of the hitobject that should already
be visible on screen when the origin comes into frame.
This commit is contained in:
Bartłomiej Dach 2019-12-26 20:23:16 +01:00
parent 005ec4b373
commit 193e41f878
1 changed files with 30 additions and 1 deletions
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31
osu.Game/Rulesets/UI/Scrolling/ScrollingHitObjectContainer.cs
View File

@ -100,7 +100,7 @@ protected override void Update()
private void computeLifetimeStartRecursive(DrawableHitObject hitObject)
{
hitObject.LifetimeStart = scrollingInfo.Algorithm.GetDisplayStartTime(hitObject.HitObject.StartTime, timeRange.Value);
hitObject.LifetimeStart = computeOriginAdjustedLifetimeStart(hitObject);
foreach (var obj in hitObject.NestedHitObjects)
computeLifetimeStartRecursive(obj);
@ -108,6 +108,35 @@ private void computeLifetimeStartRecursive(DrawableHitObject hitObject)
private readonly Dictionary<DrawableHitObject, Cached> hitObjectInitialStateCache = new Dictionary<DrawableHitObject, Cached>();
private double computeOriginAdjustedLifetimeStart(DrawableHitObject hitObject)
{
float originAdjustment = 0.0f;
// calculate the dimension of the part of the hitobject that should already be visible
// when the hitobject origin first appears inside the scrolling container
switch (direction.Value)
{
case ScrollingDirection.Up:
originAdjustment = hitObject.OriginPosition.Y;
break;
case ScrollingDirection.Down:
originAdjustment = hitObject.DrawHeight - hitObject.OriginPosition.Y;
break;
case ScrollingDirection.Left:
originAdjustment = hitObject.OriginPosition.X;
break;
case ScrollingDirection.Right:
originAdjustment = hitObject.DrawWidth - hitObject.OriginPosition.X;
break;
}
var adjustedStartTime = scrollingInfo.Algorithm.TimeAt(-originAdjustment, hitObject.HitObject.StartTime, timeRange.Value, scrollLength);
return scrollingInfo.Algorithm.GetDisplayStartTime(adjustedStartTime, timeRange.Value);
}
// Cant use AddOnce() since the delegate is re-constructed every invocation
private void computeInitialStateRecursive(DrawableHitObject hitObject) => hitObject.Schedule(() =>
{